PER CENT OF FAT IN BUTTER 111 



cock centrifuge, except for the opening in the side. It may 

 easily be adapted from the ordinary socket or if preferred the 

 socket may be sent to us and we will make the necessary changes 

 for a nominal charge. Care must be taken that the capillary 

 stem of the funnel does not project far enough through the hole 

 in the socket to strike against the side of the centrifuge while 

 being whirled. It is a good plan to fit a disk of rubber gasketing 

 in the bottom of the socket. 



SAMPLING THE BUTTER 



" In the determination of fat in butter, great care must be 

 taken in securing a representative sample and in preparing this 

 for the test. 



" Several samples from different parts of the tub or churn 

 should be taken with a butter trier. These are placed in a suit- 

 able container, such as a i-pint Mason preserve jar or a cup, 

 which is placed in water at about 100 F. The sample is then 

 mixed with a spatula or spoon until about the consistency of 

 thick cream. The sample must not be left any length of time in 

 open containers, since some of the moisture will evaporate. 

 Should the sample be kept for any reason for a day or two 

 before it is mixed, it should then be placed in warm water (with 

 the cover on the container) until melted, and then cooled while 

 being vigorously shaken until it solidifies. The reason for this is 

 that on standing some of the water will ooze out and cannot be 

 reincorporated except by emulsifying and cooling while in this 

 condition. Too much stress cannot be laid on careful sampling 

 and mixing the sample, for upon this the accuracy of any deter- 

 mination in butter very largely rests. 



DETERMINING THE FAT 



" It will be found more economical in some cases if four or 

 multiples of four determinations are made at once. In this case 

 the two double sockets containing the funnels will balance when 

 placed opposite in the centrifuge. If but one or two determina- 

 tions are to be made it will be necessary to balance the centrifuge 

 by putting weights in the opposite socket. First of all, the clean 



